This week, 3 Computer and Personal Electronics stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, Stratasys (NASDAQ:SSYS) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Stratasys makes three-dimensional printers and high-performance rapid prototyping systems for the office-based rapid prototyping and direct digital manufacturing markets. In Portfolio Grader’s specific subcategories of Earnings Revisions and Sales Growth, SSYS also gets A’s. The stock price has risen 20.5% over the past month, better than the 2.2% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of SSYS stock.

Western Digital (NASDAQ:WDC) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Western Digital Corp. designs, develops, manufactures, and sells hard drives. Wall Street has pushed the stock higher by 27.1% over the past month. The stock currently has a trailing PE Ratio of 6. For more information, get Portfolio Grader’s complete analysis of WDC stock.

Synaptics‘s (NASDAQ:SYNA) ratings are looking better this week, moving up to a B from last week’s C. Synaptics is a worldwide developer and supplier of custom-designed user interface solutions for a variety of mobile computing, communications, entertainment and other electronic devices. For more information, get Portfolio Grader’s complete analysis of SYNA stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.